OCS 1005 Chapter : Ch 3
15 Mar 2019
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Layered earth, isostasy, evidence for plate tectonics, different plate boundaries. How do we know the mantle/core etc we use earthquake waves, seismograph. P waves- compressional waves(sound) travel through liquids and solids, fast. S waves- side to side waves, travel through solids only, arrive later. Shadow zones using earthquakes to get a idea of what is inside the earth (waves refract to less dense) Earths layers 0. 4% crust 68. 1% mantle 31. 5% core. The ocean is more dense than the continental crust. Asthenosphere hot partially melted layer flowers slowly. Mantle denser and more slowly flowing than the asthenosphere. Outer core dense, viscous liquid layer extremely hot. Inner core solid, very dense, extremely hot. Eustatic 1-2 meters a year rise in water, but la sinks 9-10 a year. Mississippi river causing the sinking, sediments coming down. Marine sediments in north america and himalaya mountains. Shrinking earth concept prune theory glacial deposits (antarctic coal- comes from plants) how can they bin the.
